IOCSR instruction supports 1/2/4/8 bytes access, the address should be naturally aligned with its access size. Here address alignment checking is added in eiointc kernel emulation.

Cc: stable@vger.kernel.org Fixes: 3956a52bc05b ("LoongArch: KVM: Add EIOINTC read and write functions") Signed-off-by: Bibo Mao maobibo@loongson.cn --- arch/loongarch/kvm/intc/eiointc.c | 10 ++++++++++ 1 file changed, 10 insertions(+)

diff --git a/arch/loongarch/kvm/intc/eiointc.c b/arch/loongarch/kvm/intc/eiointc.c index d54fe805bf6e..fab5cf52779c 100644 --- a/arch/loongarch/kvm/intc/eiointc.c +++ b/arch/loongarch/kvm/intc/eiointc.c @@ -316,6 +316,11 @@ static int kvm_eiointc_read(struct kvm_vcpu *vcpu, return -EINVAL; }

+ if (addr & (len - 1)) { + kvm_err("%s: eiointc not aligned addr %llx len %d\n", __func__, addr, len); + return -EINVAL; + } + vcpu->kvm->stat.eiointc_read_exits++; spin_lock_irqsave(&eiointc->lock, flags); switch (len) { @@ -687,6 +692,11 @@ static int kvm_eiointc_write(struct kvm_vcpu *vcpu, return -EINVAL; }

+ if (addr & (len - 1)) { + kvm_err("%s: eiointc not aligned addr %llx len %d\n", __func__, addr, len); + return -EINVAL; + } + vcpu->kvm->stat.eiointc_write_exits++; spin_lock_irqsave(&eiointc->lock, flags); switch (len) {